In an error dialog, click Expand to view a tree structure listing the errors and warnings associated with your last action. 
To see more information about each error, click the plus sign (+) in the tree structure. 
You can also do the following: 
- Select an error heading, such as Error 1. All elements associated with that error are selected in the drawing area. 
  
 
- Select an element in the list to see it selected in the drawing area. 
  
 
- With an element selected in the list, click Show to search views for that element only. 
  
 
- Delete an element by selecting its check box and clicking Delete Checked. 
  
 
- Return the error dialog to the normal view by clicking Collapse.